Effect of Partial Needle Lift on the Nozzle Flow in Diesel Fuel Injectors Universidad Politécnica de Valencia

Format:

Conference/Event

Author/Creator:

Payri, Payri, author.

Contributor:

Gimeno, J.

Plazas, Alejandro H.

Venegas, O.

Conference Name:

SAE International Powertrains, Fuels and Lubricants Meeting (2011-08-30 : Kyoto, Japan)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2011

Summary:

An experimental study has been performed to evaluate the impactof different needle partial lifts on the nozzle orifices flow. Aprototype injector with a multi-orifice nozzle was used. Thisinjector allows controlling the needle lift at differentpercentages of maximum lift. Different measures of mass flow rateand spray momentum flow at several rail pressures (up to 200 MPa)were made in order to observe the effect of different needle liftpercentages on the amount of fuel injected and momentum of thejet.The influence of partial needle lifts on nozzle orifices flowwas estimated by using non-dimensional parameters of dischargecoefficient (Cd), velocity coefficient (Cv)and area coefficient (Ca). The results show aninteresting reduction in nozzle discharge coefficient at partiallift. This reduction of Cd value at partial needle liftis not only due to the drop in the velocity coefficient but also toa reduction of the effective orifice area. This decrease in thearea coefficient (Ca) at partial lift compare with thevalue at full needle lift evidences that the flow through thenozzle orifices is not controlled only by the pressure at the inletof the orifices but also by the velocity profiles at the inlet ofthe orifice, which is frequently neglected in the numericalcalculations

Notes:

Vendor supplied data

Publisher Number:

2011-01-1827

Access Restriction:

Restricted for use by site license